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Passive doppler radar for motion detection using ESP32 wifi HW #22

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Harvie opened this issue Oct 12, 2019 · 7 comments
Open

Passive doppler radar for motion detection using ESP32 wifi HW #22

Harvie opened this issue Oct 12, 2019 · 7 comments

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@Harvie
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Harvie commented Oct 12, 2019

Hello,
maybe you are familiar with doppler "radar" modules for detecting motion using RF energy reflected by human body back to detector. Like the famous RCWL-0516 (using ~3.2GHz band):

image

I am quite sure that something very similar can be achieved with 2.4GHz frontend of ESP32 chip. Eg.: transmitting some short RF signal (eg. esp-now packets) and measuring the reflected frequency for doppler shift.

That way you can detect if there is some motion near the ESP32 chip (and possibly measuring distance of the moving human/object to artificialy limit the range of motion detection).

https://www.researchgate.net/publication/283649280_A_real-time_high_resolution_passive_WiFi_Doppler-radar_and_its_applications

Do you thing there are chances that espressif will look into this topic? I believe that espressif engineers would do best job implementing such feature, since they already have knowledge of inner workings of the RF frontend hardware.

@nuschpl
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nuschpl commented Dec 29, 2023

While we can probably agree open solutions are better than DRMs and propretory code, devices RF frontends are closed and certified for a reason - the RF specturm has dedicated part for communication which is WiFi and dedicated for the radars. So while there are whitepapers which already made concept you described real and it's good for allowing the scienice go forward IMHO its not good idea to such feature generally available for script kiddies on general purpose Wifi/BT chip. As the cost of your joy would be your neighbour not able to realiably connect VPN . I doubt Espressif would involve having in mind RF device certification process

@dgoss01
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dgoss01 commented Oct 29, 2024

This can and has been achieved, and no, it does not affect the Wi-Fi signal. The ESP32 is not necessarily high resolution, but it can detect motion through wi-fi. Using a good quality WiFi card and antennas on a PC, researchers have been able to detect location and body position of people inside a building.
https://github.com/paoloinverse/bistatic_interference_radar_esp

@Huzzla101
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Huzzla101 commented Oct 31, 2024 via email

@Huzzla101
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Huzzla101 commented Oct 31, 2024 via email

@Harvie
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Harvie commented Oct 31, 2024

but wall itself is cold and showing a frequent warmth all over wall

wait what? this is not about an IR camera and i don't think temperature should be a factor here...

@Huzzla101
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Huzzla101 commented Oct 31, 2024 via email

@Huzzla101
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Huzzla101 commented Oct 31, 2024 via email

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